netdev - Re: [PATCH net-next] net: ethtool: Fix out-of-bounds copy to user

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Thu, 8 Jun 2023 17:06:31 +0800
From: Ding Hui <dinghui@...gfor.com.cn>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Alexander Duyck <alexander.duyck@...il.com>, Andrew Lunn
 <andrew@...n.ch>, davem@...emloft.net, edumazet@...gle.com,
 pabeni@...hat.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 pengdonglin@...gfor.com.cn, huangcun@...gfor.com.cn
Subject: Re: [PATCH net-next] net: ethtool: Fix out-of-bounds copy to user

On 2023/6/6 2:39, Jakub Kicinski wrote:
> On Mon, 5 Jun 2023 11:39:59 +0800 Ding Hui wrote:
>> Case 1:
>> If the user len/n_stats is not zero, we will treat it as correct usage
>> (although we cannot distinguish between the real correct usage and
>> uninitialized usage). Return -EINVAL if current length exceed the one
>> user specified.
> 
> This assumes user will zero-initialize the value rather than do
> something like:
> 
> 	buf = malloc(1 << 16); // 64k should always be enough
> 	ioctl(s, ETHTOOL_GSTATS, buf)
> 
> 	for (i = 0; i < buf.n_stats; i++)
> 		/* use stats */
> 
> :(
> 

Sorry for late.

Now I'm not sure what can I do next besides reporting the issue.

>> Case 2:
>> If it is zero, we will treat it as incorrect usage, we can add a
>> pr_err_once() for it and keep to be compatible with it for a period of time.
>> At a suitable time in the future, this part can be removed by maintainers.
> 

-- 
Thanks,
- Ding Hui